Charge/discharge control circuit and chargeable electric power s

Details Charge/discharge control circuit and chargeable electric power s Charge/discharge control circuit and chargeable electric power s

1998-11-20

1999-12-07

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

H01M 1046

Patent

active

059989742

ABSTRACT:
A charge/discharge control circuit has a voltage detector for detecting a voltage level of a secondary cell, a switch connected in series with the secondary cell, and a control circuit connected in parallel with the voltage detector for receiving and processing an output signal of the voltage detector and controlling an impedance of the switch. The voltage detector, the switch and the control circuit are integrated in a single substrate. In a preferred embodiment, the switch comprises an external connection terminal and a second terminal connected to the secondary cell, a first IGFET connected between the first and second terminals, a second IGFET connectected between the first terminal and a substrate electrode of the first IGFET, and a third IGFET connected between the second terminal and the substrate electrode of the first IGFET.

REFERENCES:
patent: 5644211 (1997-07-01), Tokuyama
patent: 5783322 (1998-07-01), Nagai et al.

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